ios - ios 将 UIScrollView 滚动条颜色更改为不同颜色

Question

我们如何将 UIScrollview 的滚动指示器的颜色更改为蓝色、绿色等？

我知道我们可以把它改成白色，黑色。但除了这些颜色。

非常感谢

score 37 · Accepted Answer

不幸的是，你不能，当然你总是可以自己动手。这些是您的选择：

UIScrollViewIndicatorStyleDefault：

滚动指示器的默认样式，黑色带白色边框。这种风格适用于任何内容背景。

UIScrollViewIndicatorStyleBlack：

一种黑色且小于默认样式的指示器样式。这种风格适合白色内容背景。

UIScrollViewIndicatorStyleWhite：

指示器的样式是白色的并且比默认样式小。这种风格适合黑色内容背景。

score 18 · Accepted Answer

这是更安全的Swift 3方法：

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    let verticalIndicator = scrollView.subviews.last as? UIImageView
    verticalIndicator?.backgroundColor = UIColor.green
}

score 11 · Accepted Answer

两个 UIScrollView 指示器都是 UIScrollView 的子视图。因此，我们可以访问 UIScrollView 的子视图并更改子视图的属性。

1 .添加 UIScrollViewDelegate

@interface ViewController : UIViewController<UIScrollViewDelegate>
@end

2.在实现部分添加scrollViewDidScroll

-(void)scrollViewDidScroll:(UIScrollView *)scrollView1
{
    //get refrence of vertical indicator
    UIImageView *verticalIndicator = ((UIImageView *)[scrollView.subviews objectAtIndex:(scrollView.subviews.count-1)]);
    //set color to vertical indicator
    [verticalIndicator setBackgroundColor:[UIColor redColor]];


    //get refrence of horizontal indicator
    UIImageView *horizontalIndicator = ((UIImageView *)[scrollView.subviews objectAtIndex:(scrollView.subviews.count-2)]);
    //set color to horizontal indicator
    [horizontalIndicator setBackgroundColor:[UIColor blueColor]];
}

注意：- 因为每次滚动时这些指标都会更新（意味着重置为默认值）。所以，我们把这段代码放在 scrollViewDidScroll 委托方法中。

在此处输入图像描述 GitHub 上提供的演示 - https://github.com/developerinsider/UIScrollViewIndicatorColor

score 9 · Accepted Answer

根据@Alex ( https://stackoverflow.com/a/58415249/3876285 ) 的回答，我发布了一些改进以更改滚动指示器的颜色。

extension UIScrollView {

    var scrollIndicators: (horizontal: UIView?, vertical: UIView?) {

        guard self.subviews.count >= 2 else {
            return (horizontal: nil, vertical: nil)
        }

        func viewCanBeScrollIndicator(view: UIView) -> Bool {
            let viewClassName = NSStringFromClass(type(of: view))
            if viewClassName == "_UIScrollViewScrollIndicator" || viewClassName == "UIImageView" {
                return true
            }
            return false
        }

        let horizontalScrollViewIndicatorPosition = self.subviews.count - 2
        let verticalScrollViewIndicatorPosition = self.subviews.count - 1

        var horizontalScrollIndicator: UIView?
        var verticalScrollIndicator: UIView?

        let viewForHorizontalScrollViewIndicator = self.subviews[horizontalScrollViewIndicatorPosition]
        if viewCanBeScrollIndicator(view: viewForHorizontalScrollViewIndicator) {
            horizontalScrollIndicator = viewForHorizontalScrollViewIndicator.subviews[0]
        }

        let viewForVerticalScrollViewIndicator = self.subviews[verticalScrollViewIndicatorPosition]
        if viewCanBeScrollIndicator(view: viewForVerticalScrollViewIndicator) {
            verticalScrollIndicator = viewForVerticalScrollViewIndicator.subviews[0]
        }
        return (horizontal: horizontalScrollIndicator, vertical: verticalScrollIndicator)
    }

}

如果不添加.subviews[0]，您将获得更深的视图，并且当您尝试更改指示器的颜色时，会出现奇怪的白色效果。那是因为它前面还有另一个视图：

通过添加.subviews[0]到每个指标视图，一旦您尝试通过调用更改颜色：

override func scrollViewDidScroll(_ scrollView: UIScrollView) {
    DispatchQueue.main.async() {
        scrollView.scrollIndicators.vertical?.backgroundColor = UIColor.yourcolor
    }
}

您将访问第一个视图并正确更改颜色：

感谢@Alex，他发布了一个很棒的解决方案

score 8 · Accepted Answer

在IOS 13

试试这个

func scrollViewDidScroll(_ scrollView: UIScrollView){


        if #available(iOS 13, *) {
            (scrollView.subviews[(scrollView.subviews.count - 1)].subviews[0]).backgroundColor = UIColor.themeColor(1.0) //verticalIndicator
            (scrollView.subviews[(scrollView.subviews.count - 2)].subviews[0]).backgroundColor = UIColor.themeColor(1.0) //horizontalIndicator
        } else {
            if let verticalIndicator: UIImageView = (scrollView.subviews[(scrollView.subviews.count - 1)] as? UIImageView) {
                verticalIndicator.backgroundColor = UIColor.themeColor(1.0)
            }

            if let horizontalIndicator: UIImageView = (scrollView.subviews[(scrollView.subviews.count - 2)] as? UIImageView) {
                horizontalIndicator.backgroundColor = UIColor.themeColor(1.0)
            }
        }
    }

score 3 · Accepted Answer

斯威夫特 2.0：

添加 UIScrollView 委托。

func scrollViewDidScroll(scrollView: UIScrollView){
let verticalIndicator: UIImageView = (scrollView.subviews[(scrollView.subviews.count - 1)] as! UIImageView)
verticalIndicator.backgroundColor = UIColor.greenColor()

let horizontalIndicator: UIImageView = (scrollView.subviews[(scrollView.subviews.count - 2)] as! UIImageView)
horizontalIndicator.backgroundColor = UIColor.blueColor()
}

score 2 · Accepted Answer

试试这个它肯定会帮助你

    for ( UIView *view in scrollBar.subviews ) {

       if (view.tag == 0 && [view isKindOfClass:UIImageView.class])
       {
        UIImageView *imageView      = (UIImageView *)view;
        imageView.backgroundColor   = [UIColor yellowColor];
       }
    }

解释：UIScrollBar 是子视图的集合。这里滚动条指示器（垂直/水平）是子视图之一，它是一个 UIImageView。因此，如果我们为 UIImageView 设置自定义颜色，它会影响滚动条指示器。

score 2 · Accepted Answer

您可以更改指示器的图像，但您应该重复执行此操作

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    self.chageScrollIndicator()
}

func chageScrollIndicator (){
    if let indicator = self.collection.subviews.last as? UIImageView {
        let edge = UIEdgeInsets(top: 1.25,
                                left: 0,
                                bottom: 1.25,
                                right: 0)
        indicator.image = UIImage(named: "ScrollIndicator")?.withRenderingMode(.alwaysTemplate).resizableImage(withCapInsets: edge)
        indicator.tintColor = UIConfiguration.textColor
    }
}

您可以使用这 2 个图像作为模板：

score 2 · Accepted Answer

在IOS 13

由于 iOS13 滚动指示器有类 _UIScrollViewScrollIndicator，而不是 UIImageView。

许多人使用的代码像

let verticalIndicator: UIImageView = (scrollView.subviews[(scrollView.subviews.count - 1)] as! UIImageView)

这不是一个好主意，因为他们承诺最后一个子视图将是 UIImageView :)。现在不是，他们可能会崩溃。

您可以尝试以下代码来获取 scrollView 指标：

extension UIScrollView {

    var scrollIndicators: (horizontal: UIView?, vertical: UIView?) {

        guard self.subviews.count >= 2 else {
            return (horizontal: nil, vertical: nil)
        }

        func viewCanBeScrollIndicator(view: UIView) -> Bool {
            let viewClassName = NSStringFromClass(type(of: view))
            if viewClassName == "_UIScrollViewScrollIndicator" || viewClassName == "UIImageView" {
                return true
            }
            return false
        }

        let horizontalScrollViewIndicatorPosition = self.subviews.count - 2
        let verticalScrollViewIndicatorPosition = self.subviews.count - 1

        var horizontalScrollIndicator: UIView?
        var verticalScrollIndicator: UIView?

        let viewForHorizontalScrollViewIndicator = self.subviews[horizontalScrollViewIndicatorPosition]
        if viewCanBeScrollIndicator(view: viewForHorizontalScrollViewIndicator) {
            horizontalScrollIndicator = viewForHorizontalScrollViewIndicator
        }

        let viewForVerticalScrollViewIndicator = self.subviews[verticalScrollViewIndicatorPosition]
        if viewCanBeScrollIndicator(view: viewForVerticalScrollViewIndicator) {
            verticalScrollIndicator = viewForVerticalScrollViewIndicator
        }
        return (horizontal: horizontalScrollIndicator, vertical: verticalScrollIndicator)
    }

}

如果您只需要一个（h 或 v 指示器） - 最好削减此功能并只保留您需要的一个（以提高性能）。

此外，最好在 DispatchQueue 中调用 update func，以保持滚动的平滑度。

func scrollViewDidScroll(_ scrollView: UIScrollView) {
   DispatchQueue.main.async {
       scrollView.updateCustomScrollIndicatorView()
   }
}

score 1 · Accepted Answer

这是滚动条颜色的改变方式：

    //scroll view  
    UIScrollView *scView = [[UIScrollView alloc] init];  
    scView.frame = self.view.bounds; //scroll view occupies full parent views  
    scView.contentSize = CGSizeMake(400, 800);  
    scView.backgroundColor = [UIColor lightGrayColor];  
    scView.indicatorStyle = UIScrollViewIndicatorStyleBlack;  
    scView.showsHorizontalScrollIndicator = NO;  
    scView.showsVerticalScrollIndicator = YES;  
    scView.scrollEnabled = YES;  
    [self.view addSubview: scView];

score 1 · Accepted Answer

如果你也想添加图片，这里是 Swift 3 的代码

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    let verticalIndicator = scrollView.subviews.last as? UIImageView
    verticalIndicator?.image = UIImage(named: "imageName")
}

这也适用于 UITableView 和 UICollectionView。

score 0 · Accepted Answer

我最近遇到了同样的问题，所以我决定为它写一个类别。

https://github.com/stefanceriu/UIScrollView-ScrollerAdditions

[someScrollView setVerticalScrollerTintColor:someColor]; 
[someScrollView setHorizontalScrollerTintColor:someColor];`

它将它与原始图像混合，因此只有颜色会改变。另一方面，也可以对其进行修改以提供自定义图像供滚动条使用。

score 0 · Accepted Answer

不久前我写了一篇关于这个的文章。不幸的是，此条的颜色由预定义的图像定义，因此如果您要更改条的颜色，则需要进行一些额外的工作。看看下面的链接，你肯定会在这里找到答案，因为我试图解决同样的问题。

http://leonov.co/2011/04/uiscrollviews-scrollbars-customization/

score 0 · Accepted Answer

至于 iOS 13 的子视图发生了变化，所以添加了简单的 if，解决了这个问题。

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 13.0) {
    UIView *verticalIndicator = [scrollView.subviews lastObject];
    verticalIndicator.backgroundColor = [UIColor redColor];
} else {
    UIImageView *verticalIndicator = [scrollView.subviews lastObject];
    verticalIndicator.backgroundColor = [UIColor redColor];
}
}

score 0 · Accepted Answer

这是我在 Swift 4 中所做的，类似于以前的答案。在我的情况下，我将图像重新着色为不可见，设置正确的角半径并且只执行一次此过程。

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    let color = UIColor.red
    guard
        let verticalIndicator = scrollView.subviews.last as? UIImageView,
        verticalIndicator.backgroundColor != color,
        verticalIndicator.image?.renderingMode != .alwaysTemplate
    else { return }
    verticalIndicator.layer.masksToBounds = true
    verticalIndicator.layer.cornerRadius = verticalIndicator.frame.width / 2
    verticalIndicator.backgroundColor = color
    verticalIndicator.image = verticalIndicator.image?.withRenderingMode(.alwaysTemplate)
    verticalIndicator.tintColor = .clear
}

score 0 · Accepted Answer

请在 iOS 渲染器上使用以下代码

 private bool _layouted;
 public override void LayoutSubviews()
 {
       base.LayoutSubviews();
       if (!_layouted)
       {
            this.Layer.BorderColor = UIColor.Red.CGColor;
            var Verticalbar = (UIImageView)this.Subviews[this.Subviews.Length - 1];

            Verticalbar.BackgroundColor = Color.FromHex("#0099ff").ToUIColor();
            var Horizontlebar = (UIImageView)this.Subviews[this.Subviews.Length - 2];

            Horizontlebar.BackgroundColor = Color.FromHex("#0099ff").ToUIColor();
            _layouted = true;
       }
}

score -2 · Accepted Answer

您可以使用自定义 UIScrollView 滚动条在滚动条中实现颜色。更多详情请看这里

ios - ios 将 UIScrollView 滚动条颜色更改为不同颜色

17 回答 17

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